I wanted to do a story in just four sentences. This is what I came up with. (Feel free to give it your own shot in the comments.)

She heard the curtain rustle behind her, and she smelled the familiar scent of sweat, cheap bourbon and stale cigarette smoke in the air. Her hand clutched her dressing gown involuntarily, but her body did not betray her as her back stayed straight and she willfully did not shiver.